The overall reaction for the generation of an NO2+ electrophile:H2SO4+HNO3⇄HSO−4+H2O+NO+2H2SO4+HNO3⇄HSO4-+H2O+NO2+can be stated in two separate, reversible steps as a protonation followed by a decomposition (Reactions 1 and 2).H2SO4+HNO3⇄HSO−4+H2NO+3H2SO4+HNO3⇄HSO4-+H2NO3+Reaction 1H2NO+3⇄NO+2+H2OH2NO3+⇄NO2++H2OReaction 2Considering both the forward and reverse directions of these two reactions, which molecule acts as a Lewis acid, but NOT as a Brønsted-Lowry acid?A.H2SO4B.HNO3C.H2NO3+D.NO2+
Question
The overall reaction for the generation of an NO2+ electrophile:H2SO4+HNO3⇄HSO−4+H2O+NO+2H2SO4+HNO3⇄HSO4-+H2O+NO2+can be stated in two separate, reversible steps as a protonation followed by a decomposition (Reactions 1 and 2).H2SO4+HNO3⇄HSO−4+H2NO+3H2SO4+HNO3⇄HSO4-+H2NO3+Reaction 1H2NO+3⇄NO+2+H2OH2NO3+⇄NO2++H2OReaction 2Considering both the forward and reverse directions of these two reactions, which molecule acts as a Lewis acid, but NOT as a Brønsted-Lowry acid?A.H2SO4B.HNO3C.H2NO3+D.NO2+
Solution
The molecule that acts as a Lewis acid but not as a Brønsted-Lowry acid in the given reactions is D. NO2+.
Here's why:
A Lewis acid is a substance that can accept an electron pair. In Reaction 2, NO2+ is formed from H2NO3+ by losing a water molecule, which involves accepting an electron pair, thus acting as a Lewis acid.
A Brønsted-Lowry acid is a substance that donates a proton (H+). In the given reactions, NO2+ does not donate a proton at any point, so it does not act as a Brønsted-Lowry acid.
Therefore, the correct answer is D. NO2+.
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